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Iridium, Ir; Cold-Drawn
Categories: Metal; Nonferrous Metal; Precious Metal; Pure Element

Material Notes: Cold-drawn applies only to tensile and/or hardness values; other property values are typical of the element.

Physical Form: Silver-White Metal; Cubic

See entry for annealed samples.

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Physical PropertiesOriginal ValueComments
Density 22.65 g/cc
 
Chemical PropertiesOriginal ValueComments
Atomic Mass 192.2171995
Atomic Number 77
Thermal Neutron Cross Section 440 barns/atom
X-ray Absorption Edge 0.16286 ÅK
 0.92425 ÅLI
 0.967 ÅLII
 1.10599 ÅLIII
Electrode Potential 1.0 V
Electronegativity 2.2Pauling
Ionic Radius 0.680 ÅCrystal Ionic Radius for Valence +4
 
Mechanical PropertiesOriginal ValueComments
Hardness, Brinell 565Converted from Vickers for 3000 kg load/10 mm ball Brinell test.
Hardness, Rockwell A 80Converted from Vickers.
Hardness, Rockwell C 56Converted from Vickers.
Hardness, Vickers 650
Tensile Strength, Ultimate 2000 MPa
Modulus of Elasticity 524 GPa
Poissons Ratio 0.26
Shear Modulus 208 GPaCalculated
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.00000470 ohm-cm
Magnetic Susceptibility 1.5e-7cgs/g
Critical Magnetic Field Strength, Oersted 15.95 - 16.05
Critical Superconducting Temperature 0.1115 - 0.1135 K
 
Thermal PropertiesOriginal ValueComments
Heat of Fusion 144 J/g
Heat of Vaporization 636 J/g
CTE, linear 6.80 µm/m-°C
@Temperature 20.0 °C
Specific Heat Capacity 0.1082 J/g-°CGas
 0.135 J/g-°C
Thermal Conductivity 147 W/m-K
Melting Point 2443 °C
Boiling Point 4428 °C
Heat of Formation 0.000 kJ/molCrystal
 665.3 kJ/molGas
 
Optical PropertiesOriginal ValueComments
Emissivity (0-1) 0.30650 nm, unoxidized
 
Component Elements PropertiesOriginal ValueComments
Iridium, Ir 100 %
 
Descriptive Properties
CAS Number7439-88-5
SolubilitySoluble in Aqua Regia

References for this datasheet.

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